Milling-tool.



No. 683,207. Patented Sept. 24, 190|. s. n. KEENE.

MILLING TO0L.

(Application filed 331i. 22, 1901.)

(No Modal.)

UNlTED STATES PATENT FFICE SAMUEL D. KEENE, OF PROVIDENCE, RIIODE ISLAND, ASSIGNOR T LORENZO P. STURTEVNT, OF NORTH SWANSEA, MASSACHUSETTS.

VilLLING-TOOL.

SPEGIFICAIION forming part of Lecters Patent No. 683,207, dated September 24;, 1901.

Application filed Jannary 22, 1901. Serial No. 44,300. (No model.)

T0 ooZZ wh0m it may concern: ing the cutter; and a similarly-driven adj ust- Be it known that I, SAMUEL D. KEENE, a ablymounted centralIy-arrtnged resilient citizen of the United States of America, and friction member. In my improvd millinga resident of Providence, in the county cf tool the cutter is located between or interme- 5 Providence and State et Rhode Island, have diate of the outer and inner spring-pressed invented certain new and useful Improvefriction members. These latter, while being ments in Milling-Tools, of which the followpositively driven or rotated, have an indeing is a speoification, pendent endwise movement. Tl1e bottom or My invention relates to improvements in enter end of each is slightly convex and 10 milling-tools-that is, suitably mounted and smooth and is adapted to bear in a yielding drivcn milling devices in which the revolving manner upon the surface of the work being cutter is adapted to cut away surplus mateoperated upon by the cutter. rial from the piece of stock or work being op- In the acoornpanying sheet 0E drawings, erated upon, the latter meanwhile being fed Figure 1 is a side elevation of my improved 15 gradually into engagement with the cutters, milling-tool. Fig. 2 is a vertical sectional thereby producinga truc surface or 011e whose view taken through the cen ter of the device, form is a counterpart of the contour et the the several parts being in their normal posicutter. ton or relation. Fig. 3 is a side view, the

It is well known that the surfaces et castlower portion being sectionally represented, 20 ings, struck-up or die worksueh, for examshowing the deviee as in use. Fig. 4 is an ple as the small parts of guns, sewing-mainverted end view of the annular cutter used chines, articles et jewelry, &c.-are more or in the milling-tool. Fig. 5 isa sectional view less nneven or irregular, and in order to truc similar to Fig. 2, showing a modification of off or remove the surplus metal from snob thecutting member, &c.; and Fig. 6 is an in- 25 surfaces the pieces are first mounted in suitverted plan view of the cutter.

able holders or clamping devices. The upper A in the drawings designates my improved orexposed surfaces are then subjectcd to the millingtool as a whole. The head or body action of suitably-operated cutting-tools portion (1 is or may be adapted to snugly 2resuch as planing, milling,grinding,filing, &c.- ceive a suitable stem or spindle s, whieh in 30 thereby cutting away the stock and reducing turn is chucked to the driving-spindle of the the surfaces, say, to a uniform plane. In some milling-machine substantially as usual. The cases it is practically impossible, or at least lowerportion of said head me1nber is rednced inconvenient, to secure the work to a holder. in diameter and has secured thereto the an- In that event, if the form and charactrof the nular cutter or hardened-steel mill c, having 5 work permits, the piece or blank is placed suitable cutting-teeth c, arranged longitudiloosely upon the holder, the latter having a nally of the mil], as common. Pins a serve slight recess therein or otherwise adapted t0 t0 rigidly secure the cutter to the head. (See the shape or contour et the blank in or on Fig. 2.) Surrounding the member a is an which the work rests. It is obvious, of course, outer casing b, the latter being adjustably se- 0 that the working relation of the several parts cured to the head by means of set-screws 1),

is such that the teeth or cutting-faces of the having their inner ends extending into 10nrevolving cutters should not engage the surgitudinally-arranged slots a formed in said face of the die or holder supporting the work. head. The lower portion of the casing is My improved milling-tool consists, essencounterbored, thus forming a charnber b, in 9 5 5 tially, of the cutter proper, preferably annuwhioh is mounted a sti helical spring m.

lar in forrn and rigidly secured to a holder e indicates an enter friction-sleeve slidably adapted to be rotatively driven in any suitfitted in the counterbored portion of said casable manner, the axis of rotation being at ing, the same extending downwardly beyond right angles With the plane of the work, a the latter and snrrounding the cutter c,while 50 yielding or resilient friction-sleeve driven by at the same time it is pressed by the spring andin unison with said holder and snrroundm. Screws b passing through the casing and into slots b formed in the sleeve, serve not only to secnre the members together, but also form stops for limiting the endwise movement of the sleeve, as clearly shown.

d indicates an inner or central friction member slidably and yieldingly mounted in the lower part of the head a in a manner substantially the same as first described with respect to the sleeve 6. The member d bas a stem portion cl, reduced in diarheter, extending upwardly into a counterbored hole d, formed in said head, and is resisted by a springn. The member d has a central screw f, extending upwardly therethrough and tapped into the head. The tension of spring 71 may be regulated by means of said screw, the latter being maintained in position after adjustment bymeans of the small set-screw a, tapped into the member a and bearing against a piece of metal, as copper, a in turn bearing against the thread of the screw. A similar screw d tapped into tlie lower part of the head a and extending into a slotted opening (1 formed in the stem portion of said friction member d, insures the axial rotation of the latter when the driving-head is actuated, and also forms a stop for limiting the endwise movement of the part d. The relative endwise adjustment of the members a and Z), thereby also regulating the force or tension of the spring m, is effected through the medium of screw a tapped into the upper end of the head, as clear]y represented. I prefer to adjust the normal relation of the 'several parts to one another so that the lower end or working face of the outer friction sleeve e Will be a little below or at least flush With the corresponding end of the cutter 0, while that of the inner or central friction member d will extend below the cutter. (Sec Fig. 2.)

The manner of operation of my improved milling-toolA is substantially as follows: The tool is first chucked or secured to the usual revolnble driving-spindle, the constrn ction of the device being such that upon revolving the spindle all the parts of the tool revolve in unison With it. Now assuming that a piece of work 11;, having a rough or irregular upper surface 10, is placed in a holder 7L and fed ahead in the arrow direction,

(sec Fig. 3,) the revolving tool, after beingproperly adjusted vertically With respect to the work, operates to cut away the surplus stock from the piece 10, while at the same time the sleeve e bears yieldingly upon the irregnlar surface w and in advance of the cutter, thereby maintaining the work in position While being operated upon by the cutter. The other orcentral sleeve or n1emberd, while capable of yieldingr vertical movement independently of the sleeve e, bears frictionally upon the trned or finished surface of the work, as clearly shown. This friction member also serves to maintainthe work in position in the holder h. The lower portion of the mernb'er 9 may be provided wirh a series of peripherally-arranged openings e, through which the chips or surplus metal cutfrom the work is discharged.

In Fig. 5 I have represented a modified form of the cntting-tool. In this case I employ a saw or annulardisk-like cutter r, adapted to be seated in the lower end of the drivinghead a, au annular screw n tapped into the head, being used to hold the cutter in position. A dowel-pin r may be used also, if desired. The inner portion of the cutter is beveled, as atr the member a being correspondingly beveled, so as to form a seat therefor. In this device I use a spring-pressed outer friction-ring 6 and a yieldingly-monnted central or inner friction member d, substantially as hereinbefore described.

I claim as my invention- 1. In a milling tool having a suitablymounted annnlar cutting member, inner and ou'ter indepehdently-movable spring-pressed friction members having said cntting 111cmber located between said friction members, substantially as described and for the purpose set forth.

2. In a revolnble milling-tool, the combination With the head or body portion and an annular cutter secured thereto of an inner or central spring-pressed endwise-movable friction member, an outer spring-"pressed endwise-movable friction member, both being adapted to revolve axially in' unison with the cutter, and having the latter located between said friction members, substantially as described and for the purpose set forth.

3. In a revoluble milling-tool, the combination with a driving-head and the cutter member secured thereto, of inner and outer spring-pressed independently-movable friction members having said cutter interposed between them and concentric therewith, the said friction members being adapted to revolve in unison With the driving-head,- substantially as hereinbef0re set forth.

4. The combination With the driving-head or cutter-holder a and an endWise-movable spring-pressed central friction member d adjustably secured thereto, of a casing b adjustably secured to said head, an endwise-movable spring-pressed friction member 6 attachedto and adapted to revolve in unison With said casing, and an annular cutter removably secured to said driving-head and 10- cated between the adjacent peripheral sides or faces of the said friction members, substantially as described.

Signed by me at Providence, Rhode Island, this 18th day of January, A. D. 1901.

SAMUEL D. KEENE.

\Vitnessesz GEO. H. REMINGTON, GRACE E. SMITH.

IIO 

